Shxtttle-dbive



0. i LAWSON & 1. H. REED.

SHUTTLE DRIVE. APPLICATION FILE-D MAR. 23, 1915.

1 215,557. Patented Feb. 13, 1917.

2 SHEETS-SHEET 1P .WITNESSES: INvENmrs:

, paw ew Z vnfiM y 41mm M I ATTyS Patnted Feb.13, 1917.

2 SHEETS-SHEET 2.

M W m EEK g 0. L. LAWSON & J. H. FIE ED.

SHUTTLE DRIVE. APPLIICATION FILED MAR. 23,1915. 1,215,557.

INVENTEHS 65% M wit cu;

\X/H'NESSESI UNITED STATES PATENT OFFICE.

OSCAR L. LAWSON AND JAMES H. REED, or main, MASSACHUSETTS.

SHUTTLE-DRIVE.

Specification of Letters Patent.

Patented Feb. .13, 191-7.

Application filed March 23, 1915. Serial No. 16,453.

all whom it may concern:

-Be it known that we, Oscar: L. LAWSON, a subject of the King of Sweden,and JAMES H. Reno, a citizen of the United States, residing at Lynn,county of Essex, State of Massachusetts, have invented a. certain newand useful Improvement in Shuttle-Drives, of which the following is aspecification, reference being had therein to the accompanying drawings.

Our invention has for its object a new and improved means foroscillating the shuttle of shoe sewing machines, particularly of thetype shown in the prior application of Oscar L. Lawson, Ser. No.841,752, filed May 29, 1911. The object of our present invention is toprovide a shuttle drive which ile giving the shuttle a rapid movement fin the time the hook of the shuttle picks u} the loop until the limit ofmovement in that direction is reached, and a slow movement in the otherdirection, shall be free from complicated cams having steep portions. Inmachines of this character, particularly those intended to be operatedat iiery high speeds it has been found that vibration and rapid wearresult wheresteep cam surfaces are employed. Our present inventiontherefore provides means for givmg the shuttle the requisite movement bymeans of mechanism having easy movements. It is found that our improvedshuttle drive can be run at high speeds with a ninimum of vibration andwear.

The invention will be fully understood from the following descriptiontaken in coni'ection with the accompanying drawings, 1nd, the novelfeatures thereof are pointed )utjand clearly defined in the claim atthe' :lose of thisspecification. In the drawings, F igure 1 is a sideelevaion. of a machine embodying our invention.

Fig. 2 is a front elevation.

In the drawings, at 11 is shown a shuttle mounted on the shuttle shaft12 and pro- 'ide'd with a. gear 13. At 14, is shown a year sectormounted on an arm 16 pivoted t 15, the center of said pivot coincidingrith the center of the pitch circle of the ear. The arm 16 is connectedwith a link 7 which is in its turn connected at 18 to a lever 19 pivotedat 20 to the frameof the machine. The lever 19 is bent and is pro videdwith a slot 21 resembling the arc of. a circle about a center locatednearer the arm 16, that is, above the slot 21. The curve of the slot isnot an arc of a true circle, but is an irregular curve which experiencehas proved to be most'satisfactory. At 22 is shown the main drive shaftprovided with a a crank disk 23 on which is a crank pin 24.

The crank pin '24 is located in the are shaped i cam slot '21 formed inthe lever 19. The crank pin rotates in the'directionindicated by thearrow in Fig. 1 and during a part of its rotation gives the shuttlepoint a very 3 slow movement because the curve of the cam slot partlyneutralizes the movement produced by the rotationof the crank disk.

During the remainder of the rotation of the crank disk, the movement iscorrespondingly accelerated by the curve of the cam slot. \Ve are awarethat shuttles have previously been driven by gear sectors but so far .aswe are aware the movement of the gear sector has been produced either byan oscillation of the shaft upon which it is naounted' or by a crankproducing a harof the curve of the cam slot and ate distance therefromand a link connecting the lever arm of the gear sector and said slottedlever, .said link belng on the concaveslde of said curved slot. I

In testimony whereof we affix our signatures, in presence of twowitnesses.

OSCAR L. LAVVSON,

I JAMES H. REED. Vitnesses:

GEORGE 1?. Dnm,

Amos H. MoRRIsoN.

